/*
 * Copyright (c) 2022 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @private
 */
export class StringBuilder {
    constructor(){
        this._str = '';
    }

    append(str){
        this._str += str;
        return this;
    }

    appendChar(str){
        this._str += str[0];
        return this;
    }

    insert(offset, str){
        this._str = this._str.slice(0, offset) + str + this._str.slice(offset);
        return this;
    }

    replace(start, end, str){
        this._str = this._str.slice(0, start) + str + this._str.slice(end);
        return this;
    }

    length(){
        return this._str.length;
    }

    setLength(length){
        this._str = this._str.slice(0, length);
        return this;
    }


    toString() {
        return this._str;
    }
}
